when clicked, the new tab is added at (or immediately adjacent to) the point where the click occurred.
With tabs to the side in 1.34.0:
when :heavy_plus_sign: is clicked, the new tab is added away from the point where the click occurred
when the sidebar is collapsed (after using the shrink icon at the same level as the plus sign), the :heavy_plus_sign: is easily misinterpreted as an expansion icon – this bugged me on scores of occasions over an extended period, it's not easy to learn to ignore the icon at which I point
Suggestion
:heavy_plus_sign: should appear at the foot, not the top, of the sidebar.
Traditionally:
With tabs to the side in 1.34.0:
Suggestion
:heavy_plus_sign: should appear at the foot, not the top, of the sidebar.